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authorAndrew Banman <abanman@sgi.com>2016-09-21 11:09:19 -0500
committerIngo Molnar <mingo@kernel.org>2016-09-22 11:16:14 +0200
commite879c1124a6c5c3367f20a254909605e7ee938c1 (patch)
tree42dcacf75a1bfe5a9c662825a89aa029b6192c0f /arch/x86
parent58d4ab46f21e7e800a7597f271a23ec602796247 (diff)
x86/platform/uv/BAU: Disable software timeout on UV4 hardware
Software timeouts are not currently supported on BAU for UV4. Instead, the BAU will rely on hardware-level fairness protocols to determine broadcast timeouts. Do not call enable_timeouts or calculate_destination_timeout on UV4. These functions write to pre-UV4 MMRs so they generate error messages on UV4. Signed-off-by: Andrew Banman <abanman@sgi.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Mike Travis <travis@sgi.com> Acked-by: Dimitri Sivanich <sivanich@sgi.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: akpm@linux-foundation.org Cc: rja@sgi.com Link: http://lkml.kernel.org/r/1474474161-265604-9-git-send-email-abanman@sgi.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/platform/uv/tlb_uv.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/x86/platform/uv/tlb_uv.c b/arch/x86/platform/uv/tlb_uv.c
index ddbeb1679b1a..72a5de7cf2e0 100644
--- a/arch/x86/platform/uv/tlb_uv.c
+++ b/arch/x86/platform/uv/tlb_uv.c
@@ -2109,7 +2109,8 @@ static int __init init_per_cpu(int nuvhubs, int base_part_pnode)
void *vp;
struct uvhub_desc *uvhub_descs;
- timeout_us = calculate_destination_timeout();
+ if (is_uv3_hub() || is_uv2_hub() || is_uv1_hub())
+ timeout_us = calculate_destination_timeout();
vp = kmalloc(nuvhubs * sizeof(struct uvhub_desc), GFP_KERNEL);
uvhub_descs = (struct uvhub_desc *)vp;
@@ -2171,7 +2172,9 @@ static int __init uv_bau_init(void)
uv_base_pnode = uv_blade_to_pnode(uvhub);
}
- enable_timeouts();
+ /* software timeouts are not supported on UV4 */
+ if (is_uv3_hub() || is_uv2_hub() || is_uv1_hub())
+ enable_timeouts();
if (init_per_cpu(nuvhubs, uv_base_pnode)) {
set_bau_off();